Prompting Claude Opus 5.5
What happened
Claude Opus 5.5 is a newer version of Anthropic’s Claude model that generates output tokens over 30% faster and often finishes tasks with fewer tokens than Claude Opus 5. It introduces several prompting patterns to handle differences such as effort calibration, thinking behavior, progress updates, unattended and multi‑agent tasks, safeguard refusals, frontend design, complex visual inputs, multi‑app workflows, and handling pasted text. The guide suggests starting with the pattern that matches the observed issue, like calibrating effort, adding thinking instructions, or marking pasted text. It also highlights stronger performance on code‑related work, financial modeling, and reading dense visual material, producing higher‑quality spreadsheets, slides, and documents with less editing.
Why it matters
For ordinary readers, the faster and more efficient model means AI‑assisted tools can respond quicker and produce more accurate results, especially when dealing with code, financial data, or visual charts. This can reduce the time and effort needed to review or edit AI‑generated outputs.
Reality check
An automated, sceptical read of the sourceIncremental. The changes are mainly speed and token efficiency improvements plus refined prompting patterns, which build on existing capabilities rather than introducing a fundamentally new technology.
Is this a big deal?
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